Results for “SQL”
Small, practical examples. Search by task or narrow things down below.
Apply a default when an insert omits a column
SQLite: A default supplies an omitted value; an explicit NULL still follows the column’s nullability rules.
SQLite✓ Tested
Attach an overall count to every row
SQL: An uncorrelated scalar subquery supplies the same aggregate to each output row.
SQL✓ Tested
Attach an overall count to every row
SQL Server: An uncorrelated scalar subquery supplies the same aggregate to each output row.
SQL Server✓ Tested
Attach an overall count to every row
SQLite: An uncorrelated scalar subquery supplies the same aggregate to each output row.
SQLite✓ Tested
Block deletion of a referenced parent
SQL: The default foreign-key action prevents deletion while a child still refers to the parent.
SQL✓ Tested
Block deletion of a referenced parent
SQL Server: The default foreign-key action prevents deletion while a child still refers to the parent.
SQL Server✓ Tested
Block deletion of a referenced parent
SQLite: The default foreign-key action prevents deletion while a child still refers to the parent.
SQLite✓ Tested
Build a query from several named stages
SQL: Separate row selection from aggregation using two common table expressions.
SQL✓ Tested
Build a query from several named stages
SQL Server: Separate row selection from aggregation using two common table expressions.
SQL Server✓ Tested
Build a query from several named stages
SQLite: Separate row selection from aggregation using two common table expressions.
SQLite✓ Tested
Calculate a cumulative integer percentage
SQL: Divide a running window sum by the complete total using a unique ordering key.
SQL✓ Tested
Calculate a cumulative integer percentage
SQL Server: Divide a running window sum by the complete total using a unique ordering key.
SQL Server✓ Tested